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PDF ISO1I811T Data sheet ( Hoja de datos )
| Número de pieza | ISO1I811T | |
| Descripción | Isolated 8 Channel Digital Input | |
| Fabricantes | Infineon | |
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ISOFACE™
ISO1I811T
Isolated 8 Channel Digital Input with IEC61131-2 Type 1/2/3 Characteristics
Data Sheet
Revision 2.0, 2012-06-14
Industrial & Multimarket
1 page  
ISO1I811T
Isolated 8 Channel Digital Input with
IEC61131-2 Type 1/2/3 Characteristics
Product Highlights
• Minimization of power dissipation due to constant current
characteristic
• Status LED output for each input
• Digital averaging of the input signals to suppress interference
pulses
• Isolation between Input and Output using Coreless
Transformer Technology
Features
Description
• Complete system integration (up to eight digital
sensor or switch inputs, galvanic isolation and
intelligent micro-controller or bus-ASIC interface)
• 8-channel input according to IEC61131-2 (Type
1/2/3)
• Integrated galvanic isolation 500VAC
(EN60664-1, UL1577)
• 3.3/5V SPI and parallel micro-controller interface
• Adjustable deglitching filters
• Up to 125 kHz sampling frequency
• VBB under-voltage detection
• Package: TSSOP-48, 8 mm x 12.5 mm
Typical Application
Programmable Logic Controllers(PLC)
Industrial PC
General Control Equipment
The ISO1I811T is an electrically isolated 8 bit data
input interface in TSSOP-48 package.
This part is used to detect the signal states of eight
independent input lines according to IEC61131-2 Type
1/2/3 (e.g. two-wire proximity switches) with a common
ground (GNDFI).
For operation in accordance with IEC61131-2, it is
necessary for the ISO1I811T to be wired with resistors
according to the application diagram.
The 8 bit parallel/serial µC compatible interface allows
the IC to directly connect to a µC system. The µC
interface also supports a direct control mode and is
designed to operate with 3.3/5V CMOS compatible
levels.
The data transfer and isolation from input to output side
is realized by the integrated Coreless Transformer
Technology.
VFI
330n
VBB
TS
IN0
12k
2k
I0H
I0L
IN7 I7H
12k
2k
I7L
S
E
R
I
A
L
I
Z
E
GNDFI
GNDBB
Data Sheet
VCC
D digital
E filter
S
E
R
I
A
L
I
Z digital
E filter
L
O
G
I
C
Rosc
DS0
DS1
/ERR
/RD
/CS
parallel
or serial
interface
µC
e.g.
XE166
ISO1I811T
GND
5 Revision 2.0, 2012-06-14
5 Page 
ISO1I811T
3 Functional Description
Functional Description
The ISO1I811T is an electrically isolated 8 bit data input interface. This part is used to detect the signal states of
eight independent input lines according to IEC61131-2 Type 1/2/3 (e.g. two-wire proximity switches) with a
common ground (GNDBB).
3.1 Introduction
The current in the input circuit is determined by the switching element in state “0” and by characteristics of the input
stage in state “1”.
The octal input device is intended for a configuration comprising of two specified external resistors per channel,
as shown in Figure 5 “Typical Application for Sensor Input Type 1, 2, and 3” on Page 13. As a result the
power dissipation within the package is at a minimum.
The voltage dependent current through the external resistor REXT is compensated by a negative differential
resistance of the current sink across pins IxH and IxL, therefore input INx behaves like a constant current sink.
The comparator assigns level 1 or 0 to the voltage present at input IxH. To improve interference protection, the
comparator is provided with hysteresis. A status LED is connected in series with the input circuit (REXT and current
sink).
If no LED is used an external resistor of 2 kΩ should be connected between IxL and GNDBB. The specified
switching thresholds may change if the resistor is used.
The LED drive short-circuits the status LED if the comparator detects “0”. A constant current sink in parallel with
the LED reduces the operating current of the LED, and a voltage limiter ensures that the input circuit remains
operational if the LED is interrupted, but the specified switching thresholds may change.
For each channel an adjustable digital filter is provided which samples the comparator signal at a rate selected by
the pins DS0 and DS1. The digital filter is designed to provide averaging characteristics. If the input value remains
the same for the selected number of sampling values, then the output changes to the corresponding state.
The control interface is compatible to standard microcontrollers. Furthermore a direct control mode can be
selected that allows the direct control of the outputs D0...D7 by means of the inputs I0H...I7H without any additional
logic signal. The µC compatible interfaces allows a direct connection to the ports of a microcontroller without the
need for other components. The diagnostic logic on the chip monitors the internal data transfer as well as the
sensor input supply. The information is sent via the internal coreless transformer to the pin ERR at the µC-Interface
side.
3.2 Power Supply
The IC contains two electrically isolated voltage domains that are independent from each other. The
microcontroller interface is supplied via pin VCC and the input stage is supplied via pin VBB. The different voltage
domains can be switched on at different times. Figure 3 shows the Start Up behaviour if both voltage domains are
powered by an external power supply. If the VCC and VBB voltage have reached their operating range and the
internal data transmission has been started successfully, the IC indicates the end of the Start Up procedure by
setting the pin ERR to logic high.
Data Sheet
11 Revision 2.0, 2012-06-14
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet ISO1I811T.PDF ] | |
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